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Flash Block is a handy and reliable Firefox addon designed to block Flash items natively and without requiring special efforts from the user.
Flash Block automatically prevent Flash advertisments or clips to populate webpages. However, these can be re-enabled from the URL address bar.
Requirements:
· Firefox 14.0 and later
What's New in This Release: [ read full changelog ]
· Deleted irrational preference from this version

Via: Flash Block 3.00.13